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(No Model.)

A. OUTHBERT.

REGENERATIVE FURNACE.

Patented June 24 INVENTOR WITNESSES:

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ANDREW CUTHBERT, OF PITTSBURG, PENNSYLVANIA.

-REGENERATl\/E FURNACE.

SPECIFICATION forming part of Letters Patent No. 301,048, dated June 24,188%. Application filed February 1], 1884; (No model.)

T 0/ whom, it may concern Be it known that I, ANDREW Cu'rnnnnr, ofPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented certain new and useful Improvements in Regenerative Furnaces,of which improvements the following is a specification.

The object of my invention is to prevent clogging or filling up of thechecker-work of regenerator chambers by the accumulation therein ofcinders and dirt from the furnace, as well as to facilitate the passageof gas to and from the furnace or melting-chamber, and to increase, asfar as may be, the amount of surface available for the absorption andemission of heat in the regenerators.

To these ends my improvements consist in a regenerator-chamber havingits upper arches formed of tiles, which are downwardly tapered on theirends, so as to form between them passages of increasing transverse areafrom top to bottom, and also in the combination of a rcgenerator-chamberhaving gas-passages of increasing transverse sectional area from theirupper to their lower sides, and a regencrator having checker-work formedof a series of bricks which are inwardly curved or beveled 011 theirsides from their center portions to their upper and lower surfaces.

The improvements claimed are hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a vertical transverse sectionthrough a regenerative melting-furnace embodying my invention; Fig. 2, avertical longitudinal section through a regenerator-chamber thereof atthe line at a: of Fig. 1; Fig. 3, a view in perspective of one of thearch-tiles; Figs. 4 and 7, similar views illustrating different forms ofregenerator-bricks adapted to the practice of my invention; and Figs. 5and 6, transverse sections of the bricks shown in Figs. 4 and 7, respectively.

My invention is herein shown in connection with a melting-furnace, 1,and regcneratorchambers 2 3 it, &c., which are, except as relating to myimprovements presently to be described, constructedand arranged in theordinary manner, and they may be of any different constructionpreferred, at the option of the constructor.

In the practice of my invention I construct the arches which form thetops or ceilings of the rcgenerator-chambers of arch-tiles 5, the endsof which are inwardly beveled or inclined toward their lower sides, asshown in Figs. 2 and 3, and thereby form between said arches a series ofpassages, 6, connecting the regenerator chambers with the upper flues,7, which passages are of gradually-increasing transverse sectional areafrom their upper to their lower sides, in lieu of being made of uniformwidth from top to bottom, as has heretofore been the case. By suchconstruction I provide a material increase of area for discharge uponthe checker-work, and thereby effect the easier exit of the escapinggases, as 1' well as cause thepartieles of cinder and dirt, which passout of the furnace through the ports 8, to be diffused over acorrespondingly larger area of the checkcr-work than heretofore. By suchdiffusion of the solid waste matters they tend to drop readily throughthe checker-work into the lower fines, 9, instead of lodging on andfilling up the interstices of the checkerwork, as is the case when theyare projected closely together upon it in passing out of the narrowopenings ordinarily employed. In order to facilitate the passage of saidsolid waste matters through thechccker-work and prevent them fromsettling therein, as well as to increase the amount of heatingsurfaccavailable in a regenerater-chamber of any given capacity, I constructthe checker-work offire-bricks, which are inwardly beveled or curved ontheir sides from their middle portions to their up per and lower faces,and provide a seat or seats on each of said faces, to admit of preperlystacking the bricks in the chambers. A checker-work thus constructedpresents practically no horizontal surfaces for the lodgment of solidmatters, as in the case of tapered bricks. The seat portions of eachcourse are covered by the bricks above it and with curved bricks. Thenarrow seats which are left between the curved faces embrace only aslight amount of horizontal surface when the bricks are stacked. Again,the diffusion of the gas through the mass of brick is more thoroughlyaccomplished and a substantial increase of area of heating'surfaceattained by the inclined or curved surfaces of the sides of thebriclgagainst -.flat seats will be covered by the courses of which thegases impinge on both their upward and their downward passage throughthe regenerator-chambers.

Figs. 4 and 5 illustrate a brick, 10, having its sides beveled orinclined inwardly from its middle portion to edges on its upper andlower faces, on which fiat seats 11 are formed at its center and ends,its section being thus alternately rectangular and trapezoidal. In achecker-work constructed of bricks of such form it will be seen that nohorizontal surfaces will be presented to the currents of gas, as thebrick above them, and the gas will impinge upon inclined side faces, 12,whether passing upwardly or downwardly through the chambers.

Figs. 6 and 7 show a brick, 13, having its sides 15 inwardly curved fromits middle portion to narrow longitudinal seats 14 on its top andbottom, curved surfaces 15-being thus presented to the impingement ofthe gas, in lieu of inclined sides 12, as in the former case, suchcurved surfaces providing an increase of heat. ing-surface andreducingthe horizontal surface presented when the bricks are stacked to suchdegree that its capacity for affording lodgment to solid matter ispractically eliminated.

The specific formsof bricks above described furnaces, having top archesformed of bricks or tiles, which are inwardly beveled or inclined ontheir ends, substantially as and for the purpose set forth.

2. A regenerator-chamber for regenerative furnaces, having in its top aseries of gaspassages of increasing transverse sectional area from theirupper to their lower sides, substantially as and for the purpose setforth.

3. The combination of a regenerator-chamher having upper gas-passages ofincreasing transverse sectional area from their upper to their lowersides, and a regenerator composed of bricks, which are inwardly curvedor inclined on their sides from their middle portions to their upper andlower surfaces, substantially as set forth.

ANDREW CUTHBERT.

Witnesses:

DARWIN S. WOLOOIT, S. HARVEY THoMPsoN.

